A Measurement of the branching ratio of pi0 ---> e+ e- using decays in flight of K(L) ---> pi0 pi0 pi0
Journal
Physical Review Letters
Journal Volume
71
Pages
31-34
Date Issued
1993-02
Author(s)
Abstract
The Fermilab E799 Collaboration has carried out a search for the rare decay 0e+e- using 0s produced from KL'000 decays in flight. We observe a signal of nine events with an e+e- mass close to the 0 mass where only one event is predicted from other known processes. From this, we measure B(0e+e-,(mee/m0)20. 95) =[7.6-2.8+3.9(stat)0.5(syst)]×10-8, over and above the contribution from 0 Dalitz decays. Correcting for radiative effects, we find this result consistent with theoretical expectations from standard-model processes. © 1993 The American Physical Society.
Type
journal article